Using * Wildcard (XP )

Hey there

I hope I'm saying this correctly ... cuz I'm not too sure of the temrinology in Access. When using Wildcards in an Access query, I am able to get the information that I want when I enter the wildcard into the actual query design. However, when I set up the query to allow me to enter a 'parameter value' the wildcard doesn't work. Is there a way around this?